<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条">
      <van-icon @click="$router.go(-1)" class='left-icon' slot='left' name='arrow-left'></van-icon>
    </van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if=' islogding'>
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if='articles.title'>
        <!-- 文章标题 -->
        <h1 class="article-title">{{articles.aut_name}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="articles.aut_photo" />
          <div slot="title" class="user-name">{{articles.aut_name}}</div>
          <div slot="label" class="publish-date">{{articles.pubdate | formatDate}}</div>
          <!-- 点击关注组件 -->
          <UserFollowed :autId='articles.aut_id' v-model='articles.is_followed'></UserFollowed>
          <!--
            v-model解析两件事
          一个事件 @input='articles.is_followed=$enevt'
          一个属性 :value='articles.is_followed'
          -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content" v-html='articles.content' ref='content'></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <ArticleCommon @click-reply='clickReply' :list='list' @upadteTotal='totalCount=$event'
          :source='articles.art_id'></ArticleCommon>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if='is404'>
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click='lodArticleInfo' class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if='articles.title'>
      <van-button class="comment-btn" type="default" round size="small" @click='isShowCommentPopup=true'>写评论
      </van-button>
      <van-icon name="comment-o" :badge="totalCount" color="#777" />
      <!-- 收藏组件 -->
      <ArticleCollection :articleId='articles.art_id' v-model='articles.is_collected'></ArticleCollection>
      <!-- 点赞组件 -->
      <ArticleSatu :articleId='articles.art_id' v-model='articles.attitude'></ArticleSatu>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
    <!-- 评论弹出层 -->
    <van-popup v-model="isShowCommentPopup" position="bottom">
      <!-- 对文章评论内容 -->
      <!-- 评论功能组件 -->
      <ArticlePost @onPostSuccess='onPostSuccess($event)' :target='id'></ArticlePost>
    </van-popup>
    <!-- 评论弹出层 -->
    <van-popup v-model="isShowReplayCommentPopup" style='height:100%' position="bottom">
      <!-- 回复评论组件 -->
      <ReplayPost :comment='comment' @click-popup='isShowReplayCommentPopup=false' v-if='isShowReplayCommentPopup'>
      </ReplayPost>
    </van-popup>
  </div>
</template>

<script>
// 回复评论组件
import ReplayPost from './components/replay-post.vue'
// 评论功能组件
import ArticlePost from './components/article-post.vue'
// 点赞功能组件
import ArticleSatu from './components/article-statu.vue'
// 文章评论组件
import ArticleCommon from './components/article-common.vue'
// 收藏组件
import ArticleCollection from './components/article-collected.vue'
// 关注组件
import UserFollowed from '@/components/user-followed'
// 获取新闻文章详情请求
import { getArticleInfo } from '@/api/article.js'
// ImagePreview 图片预览
import { ImagePreview } from 'vant'
export default {
  name: 'arctcle',
  data () {
    return {
      // 文章评论列表数据
      list: [],
      // 新闻文章详情数据
      articles: {},
      // 加载中显示
      islogding: false,
      // 加载失败：404显示
      is404: false,
      // 评论个数
      totalCount: 0,
      // 文章评论弹出层显示
      isShowCommentPopup: false,
      // 评论弹出层显示
      isShowReplayCommentPopup: false,
      // 评论项数据内容
      comment: {}
    }
  },
  props: {
    // 路由传递参数
    id: {
      type: String
    }
  },
  methods: {
    // 孙子组件点击回复
    clickReply (e) {
      console.log(e)
      this.comment = e
      this.isShowReplayCommentPopup = true
    },
    // 监听子组件添加评论
    onPostSuccess (e) {
      this.list.unshift(e)
      this.isShowCommentPopup = false
    },
    // 获取新闻文章详情
    async lodArticleInfo () {
      this.islogding = true
      try {
        const { data: res } = await getArticleInfo(this.id)
        // console.log(res)
        this.articles = res.data
        this.islogding = false
        this.$nextTick(() => {
          // 图片预览
          this.previewImg()
        })
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
        this.$toast('获取失败')
        this.islogding = false
      }
    },
    // 图片预览
    previewImg () {
      // 获取到所有的 img DOM 节点
      const imgs = this.$refs.content.querySelectorAll('img')
      // 所有图片数据
      const images = []
      imgs.forEach((item, index) => {
        images.push(item.src)
        item.onclick = () => {
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    }
  },
  computed: {

  },
  watch: {},
  filters: {},
  components: {
    UserFollowed,
    ArticleCollection,
    ArticleCommon,
    ArticleSatu,
    ArticlePost,
    ReplayPost
  },
  created () {
    // 接收路由参数
    // console.log(this.$route.params.id)
    // 获取新闻文章详情
    this.lodArticleInfo()
  },
  mounted () { }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
